HR Nivastar Mainspring G243 for ETA 1010, AS 748, Eterna 1031 - Alloy

HR Nivastar Mainspring G243 for ETA caliber 1010, AS caliber 748, Eterna caliber 1031 and Benrus BD movements plus perhaps similar ébauche watches, white alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.